What Causes Sudden Jerking While Driving the Envision?
2 Answers
Possible causes include carbon buildup in the throttle body; clutch failure; or transmission control module programming issues. Carbon buildup in the throttle body: Carbon deposits in the throttle body can cause abnormal engine air intake, leading to unstable engine RPM. This prevents the transmission control module from quickly shifting gears, resulting in jerking motions. The throttle body needs cleaning to remove carbon deposits. Clutch failure: A faulty clutch increases resistance during gear shifts, causing jerking movements. The clutch requires replacement. Transmission control module programming issues: Faulty programming in the transmission control module can cause incorrect gear shift logic, leading to jerking. The transmission control module software needs updating.
I've been driving my Envision for almost five years, and last year I experienced sudden jerking while driving. At that time, when I accelerated to 80 km/h on the highway, the car suddenly jerked violently, as if it was being held back. I did some basic troubleshooting myself: first, I checked the color and level of the transmission fluid, which appeared a bit dark, possibly due to aging causing rough shifting; then I inspected the spark plugs and found one severely carbon-fouled, affecting ignition efficiency. Later, at the repair shop, the mechanic mentioned that issues with the transmission module or clutch are quite common, especially during frequent gear shifts in city traffic jams. He recommended that Envision owners check the transmission fluid and sensors every six months and avoid sudden acceleration in daily driving. If jerking occurs, it's advised to stabilize the throttle and slowly pull over to prevent more serious malfunctions.
